Boring-drill.



H. R. HUGHES. 4

BORING DRILL.

APPLICATION HLLD JULY 15, 1909.

2 SHEETS-SHEET 2.

I 1,010,144. Patented 11011.28, 1911.

they become worn to such a UNTTED sTATEs PATENT OFFICE.

HOWARD R. HUGHES, OF HOUSTON, TEXAS.

BORING-DRILL.

Specification of Letters Patent. .Patented NOV.' 2S, 1911.

Application filed July 15, 1909. Serial No. 507,678.

To all whom 'it may concern:

Be it known that I, HOWARD R. HUGHES, a citizen of the United States, residing at Houston, Texas, have invented a certain:

new and useful Improvement in Boring- Drills, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains lto make and use the same.

This invention rel. tes to bormg drills, and particularly to rollerl drills of the typev shown in my U. S. Letters Patent No. 930,759, dated August 10, 1909.

One object of my present invention is to pr'ovide a drill of the type referred to in which the head is provided with removable bearing surfaces for the rollers' so that said bearing surfaces can be renewed whenever degree that the rllers will not run true.

Another object of my invention is to promy invention will be hereinafter pointed out. f x

Figure 1 is an endj view of ay drill constructed 1n accordance with my present invention, one;; of.the, rollers being removed to lmore clearly 'illustrate the construction of the spindles which carrythe main cutting rollers; Fig. 2 is a vertical sectional view taken on approximately the line 2-2 of Fig. 1; Fig. 3 is a vertical elevational view of one of the members that forms part of the head of the drill; Fig. 4 is a perspective view of one,of the removable bearing surfaceson the head; and Fig.- 5 is a yperspective view of one of the rings that is employed for retaining the rollers on their spindles.

Referring to the drawings which illustrate the preferred form of my present invention, 1 designates a pair of members that form the head of the drill, .said members being clamped together by any suit-able device, such, for example, as asleeve 2. While I have herein shown a head vthat consists of only two members I wish it to be understood that my broad idea is this exact construction for',

which a pin- 8,01* other suitable not limited to if desiredyflih'e.,

head could be made up of a different number of members.

In Vthe 'construction herein shown, a pair of approximately frusto-co-nical-shaped cutting rollers A are arranged diametrically opposite eachother l,on spindles 3 that project inwardly toward the longitudinal axis of the head, and a second pair of approximately frusto-conical-shaped rollers B are arranged between the rollers A, as shown in Fig. 1, the spindles of the rollers B, however, being inclined oppositely to the spindlesv of the cut-ting rollers A.

In the construction illustrated in Fig. 2,

the spindles 3 are formed integral with the .members -1 that constitute the head, each of,

said members being provided with one spindle. Each of said spindles has an approxi'- matelyfrusto-conical-shaped end portion 3 anda taperedbase portion 3" on which a removable cone-shaped Aring 4 is mounted to provide a bearing surface fo-r the roller, the outer face of said ring 4 being of the same angularity as the outer surface of the conical-shaped end portion 3 of the spindle so that the roller true bearing surface to travel on. If 'desired, the coperating surfaces ofthe base portion 3b and the ring4 can be provided with shoulders that serve to vtake up the A on said spindle will have a:

end thrusts to which the roller is subjected.

The intermediate `portion of the spindle 3 is notched out or grooved, as shown in Fig. 2, so as to receive a locking ring 5 that retains the lroller in operative position on 'the spindle, and if desired, a washer 6 can -be -arranged between the under side of sald locking ring'andthe upper edge of -themember 4 that forms the removable bearing surface for the roller. The locking ring 5 is ,prefera-bly split or divided so that it can be;

slipped'over the conical-shaped `head of the spindle and arranged in the groove vinthe intermediate ,portion thereof, and after said locking ring has `been arranged in -thlsfposition the roller A is screwed onto said ring,

-t'eing provided with 'a hole 7a for re:

provided with external the roller has been securely connected to the ring 5, the pin 8 is removed so that the locking ring 5 can rotate with the roller. The ring 5 thus forms practically an inwardly projectin flange or ribV on the internal bore of the ro ler that projects into a groove in the spindle so as to prevent the roller from moving longitudinally of the spindle. the spindle being provided with a tapered bearing surface for the roller on' each side of the groove in the lintermediate portion of the spindle.

In drills of this type the cutting rollers have to be renewed Very often owing to the,

fact that they become drilled and broken, and asthe frictional engagement between the rollers and their spindles is very great the spindles are apt to Wear away rapidly and unevenly, especially at their inner ends Where they are connected to the head. Consequently, when a roller is mounted on a spindle that has worn away unevenly the roller will not run true. One of the most desirable featuresb of the drill herein shown is that it insures a true bearing surface for each roller for if the outer surface of the conical-shaped ring 4 wears unevenly or wears excessively, another ring can be substituted for the worn one and thus produce practically a perfect spindle or bearing surface' for the cutting roller.

y The rollers A are provided with cutting Vsurfaces that disintegrate the material on the bottomof the hole being formed, and said rollers are also provided with substantially chisel-shaped cutting teeth 9 that shear olf the material from the; sides of the hole. I prefer to form these chisel-teeth 9 slightly curved or concaved, as, shown in Fig. 2, so that when the lower" ends 9",0 f the teeth Wear away there will still be a cutting edge that will shear off the material on the sides of the hole. Preferably, one or both of the rollers A is provided with a cutting surface that consists of a plurality of chiselteeth 10 and two sets of pyramidalshaped projections 11 and 12, the projections 11 being staggered relatively tothe projections 12, as shown clearly in Fig. 3, so that 4 the material will be finely cut or divided.

By providing the roller with a cuttin surface of this character I obtain practlcally the same results as I wouldfrom three rollers one of which had vchisel-teeth and the others pyramidal-shaped projections.

The rollers B which are arranged between the rollers A are approximately frusto-conical-shaped and are rovided with chiselteeth 13 that shear oip the material from the sides of the hole being formed. Theft,1 rollers B are much smaller than the rolle s A, and they are so disposed that they lprevent the head of the drill from wabblixig or moving laterally in the hole being formed.

socket. A washer 18 is Vpreferably arranged between the head and the under side of each of the rollers B so as to revent wear. rIhis manner of connecting t e rollers B to the head is very desirable for no separate fastening .devices are necessary to retain the rollers in position. In lassembling the parts of the drill, the rollers A areirst mounted on their spindles in the manner previously described, and the two members 1 of the head are then placed together to embrace the spindles ofthe rollers B, the members 1 of the head being thereafter clamped together by the sleeve 2 or other suitable device.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A drill comprising ahead,` a spindle on s aid head havinga groove or reduced portion, a roller rotatably mounted on said spindle, and a locking ring screwed into said 2. In a drill, al spindle having an approximately frusto-conical-shaped end portion, gsaid spindle being provided with a groove and a conical-shaped base portion, aroller .mounted on sald spindle, and a devlce on said roller that projects into the groove formed in the spindle. 1 e

3. In a drill, a spindle -provided intermediatev its ends 'with a groove or recess, a reh movable member""mounted on'the base portion of said spindle toact as a bearing surface, a roller mounted on said spindle and surrounding said member, and means on said roller that projects into said groove so as to prevent the roller from' moving longitudinally.

4. A drill comprisinga head, a pair of approximately frusto-conical-shaped cuttin rollers arranged diametrically opposite eac other and mounted on spindles that project inwardly toward the longitudinal axis of the head, and a second pair of approximately frusto-conical-shaped cuttin rollers arranged between the rollers first re erred to and having their spindles projecting outwardly Vfrom the longitudinal axis of of the v head.

5. A drill comprising a head provided with approximately frusto-conioal-shaped cutting rollers that operate on the material in the bottom of the hole being formed, and rollers carried by said head and operating on the sides of the hole being' formed to prevent the head from Wabbling or moving laterally. l

6. A roller boring drill provided with a head having a pair of approximately coniral-shaped cutting rollers which are o arranged that they operate. on the bottom and partly on the side of the hole being formed,

and separate rollers on said head which operate only on the sldes of the hole.

7. ln a drill, a head provided with a pair ot' approximately trusto-conieal-shaped outting rollers arranged diametrioally opposite each other and having cutting surfaces that operate on the bottom and sides of lthe hole being formed, and a second pair of approximately frusto conical shaped rollers arranged between the rollers first referred to and having cutting surfaees that operate on the sides of the hole being formed.4

8. A roller for a boring drill, said roller being of approximately frusto-conical-shape and provided with a cutting surface that is composed of a set of chisel-teeth, and a plurality of sets of pyramidal-shaped projections, the projections of one set being arranged staggered relatively to the projections of the other set.

t). In a. drill, an approximately frustoconical-.shaped cutting roller whose inclined surface operateson the bottom of the hole being` termed` and teeth on said roller that operate on the sides of the hole being formed, said teeth being slightly ooncaved. 1

In testimony whereol I hereunto atlix my signature in the presence of two Witnesses, this 8th day .of July, 1909.

HOWARD R. HUGHES.

- lVitnesses:

f VVM.`D. BATES, W. L. THOMAS. 

